“Cinema,” for those who dislike the movies, is a word that combines “sin” and “enema.” The book I Lost My Heart in Hollywood: Diary of a Dick (2011) by Will Veharo explained:
 
“With an ‘s.’ Sin-e-ma. Or may it’s sin-enema. The shit flows out of the theater and gets flushed down your brain.”
   
“No wonder some people believe that the word ‘cinema. is a combination of ‘sin’ and ‘enema,’” Thomas DiLorenzo wrote on LewRockwell.com on February 12, 2013. DiLorenzo made a similar comment on LewRockwell.com Blog on June 11, 2018.
 
           
Google Books
I Lost My Heart in Hollywood:
Diary of a Dick
By Will Viharo
Lulu Press (Lulu.com)
2011
Pg. 41:
“It ain’t porn, Doc, it’s straight cinema.”
 
“With an ‘s.’ Sin-e-ma. Or may it’s sin-enema. The shit flows out of the theater and gets flushed down your brain.”
 
Twitter 
Jennifer Murphy
@jmurphzilla
cinema, sin enema, cinnamon-a… whatever… time for work.
7:22 PM - 23 Sep 2011
       
LewRockwell.com
Spielberg’s Sovietization of U.S. History: The Bait-and-Switch Game of ‘Historical Docudrama’
By Thomas DiLorenzo
February 12, 2013
(...)
No wonder some people believe that the word “cinema” is a combination of “sin” and “enema.”
 
Twitter
Alan Palmer
@AmericanNacre
http://lewrockwell.com/dilorenzo/dilorenzo248.html … Re: Spielburg’s dishonest Abe, “No wonder some people believe that the word cinema is a combination of sin and enema.”
5:13 PM - 12 Feb 2013
 
Twitter
Brittany
@Brittacus
Trying to come up with a joke about how “cinema = sin + enema” and I’m stumped. Are poop jokes still funny?
12:30 PM - 19 Oct 2013
 
Twitter 
Grand Roff Tarkin
@TVsRoss
“It’s ‘cinema’ in that it’s a sin mixed with an enema” - @syfant
7:27 PM - 14 Oct 2014
   
Twitter
j.c.
@crimebuses
Replying to @BaileyJayTweets
@BaileyJayTweets cinema/sinema/sin enema
12:58 PM - 17 May 2015
   
Twitter
Babette Bombshell ™
@BabetteBombshel
Thanks 2 everyone who came out & braved a tropical storm to hear me sing filth. It was an evening that put the sin & enema back into cinema.
3:43 PM - 8 Jul 2017
 
LewRockwell.com Blog
2:33 pm on June 11, 2018
Far-Left Hate Group Wildly Cheers Foul-Mouthed F-Bomb Dropper
Thomas DiLorenzo
(...)
No wonder so many people think of “cinema” as being a combination of “sin” and “enema.”